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3 years ago

Please answer my this

Mathematics

1 answer:

kap26 [50]3 years ago

3 0

perimeter: 16 $\sqrt{5}$

multiply it by 4 (since it's a square)

area: 80

it's a square so all you need to do is multiply it by itself

4 x $\sqrt{5}$

16 x 5 (squared them)

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Round 128,955 to the 8 place value

Jet001 [13]

There are only 6 place values in 128,955.

If you would round it it could be:

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2 years ago

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2x - 5y = - 15

UkoKoshka [18]

Answer:

2x+15=5y

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One member of a gardening club can plant flowers in 12 hours. With two members of the club working together the job can be done

mariarad [96]

Answer:

24 hours

Step-by-step explanation:

One member of the gardening club can alone plant flowers in 12 hours.

So in 1 hour he can plant 1/12 of the flowers.

Let the time required by the second member of the club to plant flowers alone be x hours.

Then in 1 hour he can plant 1/x of the flowers.

Now when the two members work together,each hour they can plant:

$\frac{1}{12}+\frac{1}{x}$ of the flowers.

But they can together complete the job in 8 hours. So in one hour they plant 1/8 of the flowers.

=> $\frac{1}{12}+\frac{1}{x}=\frac{1}{8}$

=> $\[\frac{1}{x}=\frac{1}{24}\]
$

=> x=24

So the second member can plant the flowers alone in 24 hours

4 0

3 years ago

During a rock concert, the noise level (in decibels) in front row seats has a mean of 92 dB with a standard deviation of 9 dg_ W

rodikova [14]

Answer:

The minimum percentage of noise level readings within 8 standard deviations of the mean is 98.44%.

Step-by-step explanation:

When we do not know the shape of the distribution, we use the Chebyshev's Theorem to find the minimum percentage of a measure within k standard deviations of the mean.

This percentage is:

$p = 1 - \frac{1}{k^{2}}$

Within 8 standard deviations of the mean

This means that $k = 8$ . So

$p = 1 - \frac{1}{8^{2}} = 1 - \frac{1}{64} = \frac{64 - 1}{64} = \frac{63}{64} = 0.9844$

The minimum percentage of noise level readings within 8 standard deviations of the mean is 98.44%.

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3 years ago

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miss Akunina [59]

Answer:

Step-by-step explanation:

She uses 1/6th a cup of flour with 2/3 cup of water. To use 1 cup of flour she has to do this 6 times.

6 * 2/3 = 12/3 = 4 cups

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3 years ago